We saw a large silver and brightly coloured cigar shape stationary for 5-7 minutes which just dissapeared

Well bit of background..was brought up in Norfolk England and have seen many aircraft because of so many air bases in the area so I kinda know what's weird and what's not. 
A normal Autumn day had a walk in Highwoods, Colchester with my then girlfriend. The sky was blue and there were no clouds in sight. Looked up as we were walking back to my residence and I saw a cigar shaped aircraft...didn't think to much about it because of the tregectary it seemed like a silver aircraft carrier and as we were in a "military training zone we saw lots of aircraft so no big deal right? The wings would have been practically equal to my line of sight.When an aircraft that big comes into sight it always appears cumbersome and slow so I did not really pay much attention cause the craft from a distance always seem to move slowly because they are so high. Dinn't think too much about it because I assumed I couldn't see the wings as they were equal to my line of sight and therefore I would not be able to see the wings. Anywaywe continued to walk and after about 5 minutes the craft as we observed still appeared stationary. This caught my attention and I therefore paid more attention to it...and then I noticed that the under carriage was brighly lit which could not be possible as it was around 3pm and the sun would illuminate the craft to the far side not the under carriage. On closer inspection we realised it had not moved for 5 minutes and that we were actulley getting closer. We were just stunned and did not even consider it to be anything other than a terrestrial craft. Until when we were debating what it was and when we looked up after around 10-15 seconds it had just vanished!